Decorative sheet, cover panel, display device, method for manufacturing decorative sheet, and method for manufacturing cover panel

Abstract

[Problem] To provide: a display device in which micro holes are unlikely to be visually recognized even when a light source is turned off; a decorative sheet and a cover panel used for the display device; a method for manufacturing the decorative sheet; and a method for manufacturing the cover panel. [Solution] Provided is a decorative sheet comprising a base film, a design layer, and a color-adjusting layer. In the design layer, a design is expressed by a first ink layer provided on the base film, and a plurality of micro holes transmitting light are formed in the first ink layer. The color-adjusting layer closes the micro holes with a second ink layer. The difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-adjusting layer is −7 to +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-adjusting layer is −7 to +7.

Description

Decorative sheet, cover panel, display device, method for manufacturing a decorative sheet, and method for manufacturing a cover panel.

[0001] The present invention relates to a decorative sheet, a cover panel, a display device, a method for manufacturing a decorative sheet, and a method for manufacturing a cover panel.

[0002] Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2021-160317) discloses a cover panel including a decorative sheet including a base film and a design layer formed on the base film, and a display device using the cover panel. The cover panel disclosed in Patent Document 1 has a light transmission region in which a plurality of micro holes that transmit light irradiated from a light source are formed in the decorative sheet.

[0003] In the display device of Patent Document 1, between visual recognition targets (primary objects) represented on the design layer and visible by reflection of incident light, a visual recognition target (secondary object) different from the primary object is displayed by light irradiated from a light source and transmitted through the micro holes. The display device of Patent Document 1 displays a secondary object in a light transmission region where only the primary object was visible when the light source was not lit, by lighting the light source.

[0004] Japanese Unexamined Patent Application Publication No. 2021-160317

[0005] In the display device of Patent Document 1, it is preferable that only the primary object is visible when the light source is not lit. However, when the light source is not lit, the micro holes through which light does not transmit are visible as black dots. In particular, in the case of a display device using a decorative sheet in which the primary object is represented by a color with relatively high brightness, since the contrast difference between the primary object and the micro holes through which light does not transmit is large, there is a problem that the micro holes are easily visible when the light source is not lit.

[0006] An object of the present invention is to provide a display device in which micro holes are hardly visible even when the light source is not lit, a decorative sheet and a cover panel used for the display device, and a method for manufacturing the decorative sheet and a method for manufacturing the cover panel.

[0007] Several embodiments for solving the problem are described below. These embodiments can be combined as needed.

[0008] A decorative sheet according to a first aspect of the present invention comprises a base film, a design layer, and a color-tuning layer. The design layer is formed by a first ink layer provided on the base film, and a plurality of light-transmitting microholes are formed in the first ink layer. The color-tuning layer is a second ink layer that seals the microholes. In the L*a*b* color system, the difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-tuning layer is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-tuning layer is between -7 and +7.

[0009] In this decorative sheet, the difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-matching layer is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-matching layer is between -7 and +7. Therefore, the contrast between the color of light transmitted through the base film and reflected by the first ink layer and the color of light transmitted through the base film and reflected by the color-matching layer (second ink layer) is suppressed. Consequently, in a display device using this decorative sheet, micro-holes are difficult to see when the light source is not illuminated.

[0010] A decorative sheet according to a second aspect of the present invention is a decorative sheet according to a first aspect, wherein the color-tuning layer contains an interference pigment.

[0011] The inclusion of interference pigments in the color-tuning layer suppresses changes in the color of light transmitted through the second ink layer.

[0012] A decorative sheet according to a third aspect of the present invention is a decorative sheet according to a first aspect, wherein the color-tuning layer contains a metallic pigment.

[0013] The inclusion of metallic pigments in the color-matching layer suppresses changes in the color of light transmitted through the second ink layer.

[0014] A cover panel according to a fourth aspect of the present invention comprises a molded member layer on which any of the decorative sheets according to the first aspect or the third aspect is laminated.

[0015] In display devices using this cover panel, micro-holes are difficult to see when the light source is not illuminated.

[0016] A display device according to the fifth aspect of the present invention comprises a cover panel according to the fourth aspect and a light source that irradiates the cover panel with light from the molded material layer side. In this display device, microholes are difficult to see when the light source is not illuminated.

[0017] A method for manufacturing a decorative sheet according to the sixth aspect of the present invention is a method for manufacturing a decorative sheet according to the first or third aspect, comprising the steps of forming a first ink layer on a base film and forming microholes in the first ink layer by laser processing.

[0018] A method for manufacturing a decorative sheet according to the seventh aspect of the present invention is a method for manufacturing a decorative sheet according to any of the first or third aspects, comprising the step of forming a design layer on a base film by silk printing.

[0019] A method for manufacturing a cover panel according to the eighth aspect of the present invention is a method for manufacturing a cover panel according to the fourth aspect. This manufacturing method comprises the steps of setting a decorative sheet in a mold and clamping the mold, and injecting a molten material into the cavity of the mold to form a molded member layer and bonding a decorative sheet to the surface of the molded member layer.

[0020] A cover panel according to the ninth aspect of the present invention comprises a base film, a design layer, and a color-tuning layer. The design layer is formed by a first ink layer provided on the base film, and a plurality of light-transmitting microholes are formed in the first ink layer. The color-tuning layer seals the microholes with resin. In the L*a*b* color system, the difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-tuning layer is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-tuning layer is between -7 and +7.

[0021] In this cover panel, the difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-tuning layer is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-tuning layer is between -7 and +7. Therefore, the contrast between the color of light transmitted through the base film and reflected by the first ink layer and the color of light transmitted through the base film and reflected by the resin of the color-tuning layer is suppressed. Consequently, in a display device using this cover panel, micro-holes are difficult to see when the light source is not illuminated.

[0022] A display device according to the tenth aspect of the present invention comprises a cover panel according to the eighth aspect and a light source that irradiates the cover panel with light from the color-tuning layer side.

[0023] In this display device, micro-holes are difficult to see when the light source is not illuminated.

[0024] A method for manufacturing a cover panel according to the eleventh aspect of the present invention is a method for manufacturing a cover panel according to the ninth aspect, comprising the steps of: forming a first ink layer on a base film; forming microholes in the first ink layer by laser processing; setting the base film in a mold and clamping the mold; and injecting resin into the cavity of the mold to form a color-matching layer and sealing the microholes with resin.

[0025] A method for manufacturing a cover panel according to the twelfth aspect of the present invention is a method for manufacturing a cover panel according to the ninth aspect, comprising the steps of: forming a design layer on a base film by silk printing; setting the base film in a mold and clamping the mold; and injecting resin into the cavity of the mold to form a color-matching layer and sealing microholes with resin.

[0026] In a display device using the decorative sheet according to the present invention, micro-holes are difficult to see when the light source is not illuminated.

[0027] This figure shows an example of using the display device 1. This figure shows an example of using the display device 1. This is a schematic cross-sectional view of the display device 1. This is a schematic cross-sectional view of the cover panel 10. This is a schematic cross-sectional view of the cover panel 10 according to modified example 2. This is a schematic cross-sectional view of the cover panel 10a. This is a schematic cross-sectional view of the cover panel 10a.

[0028] <First Embodiment> (1) Overall Configuration The display device 1 according to the first embodiment comprises a cover panel 10 and a light source 20. The cover panel 10 comprises a decorative sheet 100 and a molded member layer 200. Figures 1 and 2 are diagrams showing examples of use of the display device 1 according to the embodiment of the present invention. Figure 3 is a schematic cross-sectional view of the display device 1. First, the display device 1 will be described using a display device 1 mounted on the center console 300 of an automobile as an example.

[0029] The display device 1 displays a secondary object, which is a different object to be seen from the primary object, on top of a primary object that is visible when incident light IL1 from the surface 11a (see Figure 3) of the cover panel 10 is reflected, and transmitted light TL1, which is transmitted when incident light IL2 irradiated from the light source 20 passes through microholes 132 and 142 (microholes 132 and 142; details will be described later), is transmitted through microholes 132 and 142. As shown in Figures 1 and 2, the center console 300 has cover panels 10 with a wood grain pattern, which is a primary object, attached to many parts of it.

[0030] The cover panel 10 includes a first region Ar1, a second region Ar2, and a third region Ar3.

[0031] The first region Ar1 is the region where the primary object is represented, and where the secondary object is displayed when the light source 20 is lit. In the first region Ar1, when the light source 20 is not lit, only the primary object is visible, and when the light source 20 is lit, the information displayed on the light source 20 is visible as a secondary object. In the example shown in Figure 1, the light source 20 displays time information consisting of the letters "PM" and the numbers "02:46" indicating the time.

[0032] The light source 20 is positioned in a location corresponding to the first region Ar1, facing the back surface 11b (see Figure 3) of the cover panel 10. As will be described in detail later, the decorative sheet 100 has microholes 132 and 142 formed in a location corresponding to the first region Ar1, which allow the incident light IL2 irradiated from the light source 20 to pass through, and a design layer 130 (described later) is provided.

[0033] The second region Ar2 is a region where the primary object is represented, and where the secondary object is not displayed when the light source 20 is illuminated. The light source 20 is not positioned in a location corresponding to the second region Ar2. The decorative sheet 100 has a design layer 130 in a location corresponding to the second region Ar2, but no microholes 132 are formed therein.

[0034] The third region Ar3 is a region where no primary object is represented and where no secondary object is displayed when the light source 20 is illuminated. The light source 20 is not positioned in a location corresponding to the third region Ar3. The decorative sheet 100 does not have a design layer 130 in a location corresponding to the third region Ar3, and no microholes 132 or 142 are formed there. In the example shown in Figures 1 and 2, the third region Ar3 is the location where "P," "R," "N," and "D," which indicate the operating position (range) of the automatic transmission selector lever 310, are displayed. The molded member layer 200 has a metal display plate (not shown) with the letters "P," "R," "N," and "D" printed on it, positioned in a location corresponding to the third region Ar3.

[0035] Here, we have described the case where the primary object is a wood grain pattern, but the primary object is not limited to designs such as wood grain patterns. The primary object may be, for example, a code or figure for conveying information. Similarly, we have described the case where the secondary object is a code such as letters and numbers, but the secondary object may be, for example, a decorative pattern, and is not limited to a code or figure for conveying information.

[0036] (2) Detailed configuration of the display device 1 (2-1) Cover panel 10 The cover panel 10 is a roughly plate-shaped member used for decorating and protecting electrical appliances, automobiles, electronic devices, buildings, etc. The cover panel 10 comprises a decorative sheet 100 and a molded member layer 200. Figure 4 is a schematic cross-sectional view of the cover panel 10. Figure 4 is a schematic cross-sectional view of the first region Ar1 of the cover panel 10.

[0037] (2-1-1) Decorative sheet 100 The decorative sheet 100 comprises a hard coat layer 110, a base film 120, a design layer 130, a light-shielding layer 140, and a color-matching layer 150. In the following description, the side of the decorative sheet 100 facing the molded member layer 200 will be called the back surface 101b, and the side opposite to the back surface 101b will be called the front surface 101a.

[0038] (a) Hard coat layer 110 The hard coat layer 110 is a protective layer for the decorative sheet 100. The hard coat layer 110 also allows the light incident from the surface 11a of the cover panel 10, the transmitted light TL1 that has passed through the microholes 132 and 142, the reflected light RL1 that has been reflected by the design layer 130, and the reflected light RL2 that has been reflected by the color-matching layer 150 to pass through it (see Figure 4). The hard coat layer 110 is formed on the surface 101a side of the base film 120. It is preferable that the hard coat layer 110 has a higher hardness than the base film 120 and the molded member layer 200. The thickness of the hard coat layer 110 is selected from a range of, for example, 3 μm to 20 μm, although this is not limited to the hard coat layer 110.

[0039] The material of the hard coat layer 110 is, for example, a resin. Examples of resins used as the material for the hard coat layer 110 include UV-curable and ionizing radiation-curable resins such as polyester acrylate and urethane acrylate, or thermosetting resins such as acrylic and urethane resins. Preferably, the hard coat layer is formed to exhibit a hardness of HB or higher in a pencil hardness test (load 750g) in accordance with JIS K5600-5-4.

[0040] The hard coat layer 110 is formed on the base film 120 using a known method for forming a thin film. Specifically, the hard coat layer 110 is formed using, for example, a wet coating method, a lamination method using a hard coat film, or a transfer method using a hard coat transfer film.

[0041] (b) Base film 120 The base film 120 supports the hard coat layer 110 and the design layer 130. The base film 120 transmits incident light IL1, transmitted light TL1, reflected light RL1, and reflected light RL2. The thickness of the base film 120 is selected from a range of, for example, 50 μm to 5000 μm, although this is not limited to the base film 120.

[0042] The material of the base film 120 is, for example, at least one of a light-transmitting resin and a light-transmitting elastomer. Examples of resins used as the material for the base film 120 include polyester resin, polyethylene terephthalate (PET) resin, acrylic resin, polycarbonate resin, polybutylene terephthalate (PBT) resin, triacetylcellulose resin, styrene resin, or ABS resin. The base film 120 may also be a multilayer film of acrylic resin and ABS resin, or a multilayer film of acrylic resin and polycarbonate resin. Examples of elastomers used as the material for the base film 120 include thermoplastic elastomers (TPE). Examples of thermoplastic elastomers include amide-based TPE (TPA), ester-based TPE (TPC), olefin-based TPE (TPO), styrene-based TPE (TPS), and urethane-based TPE (TPU). The base film 120 may also be a film formed by laminating a resin film and an elastomer film.

[0043] (c) Design layer 130 The design layer 130 is a layer in which a design, which is a primary object, is represented by a first ink layer 131 provided on the base film 120, and a plurality of micro-holes 132 that transmit light are formed in the first ink layer 131. The design layer 130 is formed on the surface of the base film 120 opposite to the surface on which the hard coat layer 110 is formed. In the region of the design layer 130 corresponding to the first region Ar1, a plurality of micro-holes 132, which are openings through which the transmitted light TL1 passes, are formed. In the present embodiment, the first ink layer 131 of the design layer 130 contains an interference pigment. In the present embodiment, the design layer 130 is composed of two ink layers, but the design layer 130 may be composed of one ink layer or three or more ink layers. Although not limited, the thickness of the design layer 130 is selected, for example, from the range of 5 μm to 30 μm.

[0044] The first ink layer 131 of the design layer 130 is formed by coating such as comma coating. Also, the micro-holes 132 are formed by laser processing. By using laser processing, the micro-holes 132 are formed simultaneously with the micro-holes 142 of the light shielding layer 140 described later. In other words, the manufacturing method of the decorative sheet 100 may include a step of forming the first ink layer 131 on the base film 120 and a step of forming micro-holes in the first ink layer 131 by laser processing.

[0045] (d) Light shielding layer 140 The light shielding layer 140 is a layer that blocks (shields) the incident light IL2. The light shielding layer 140 is formed on the surface on the back surface 11b side of the design layer 130. In the light shielding layer 140, micro-holes 142, which are openings through which the transmitted light TL1 passes, are formed at the same positions as the micro-holes 132 of the design layer 130. Although not limited, the thickness of the light shielding layer 140 is selected, for example, from the range of 5 μm to 20 μm.

[0046] The light shielding layer 140 is formed, for example, using an ink in which a black absorbing pigment with a light transmittance close to 0 is dispersed in a resin.

[0047] The light-shielding layer 140 is formed by coating such as comma coating. As described above, the micro-holes 142 are formed by laser processing simultaneously with the micro-holes 132. Hereinafter, the micro-holes 132 and 142 may be collectively referred to as micro-holes 132, 142. Although not limited, the diameter of the micro-holes is formed to be about 50 μm to 500 μm. More specifically, when the cover panel 10 is used for interior parts, the diameter of the micro-holes is formed to be about 50 μm to 100 μm. Also, when the cover panel 10 is used for exterior parts, the diameter of the micro-holes is formed to be about 100 μm to 500 μm.

[0048] (e) Color adjustment layer 150 The color adjustment layer 150 is a layer that closes the micro-holes 132 and 142 with the second ink layer 151 and changes the color tone of the reflected incident light IL1 to the reflected light RL2. The color adjustment layer 150 only needs to close at least the micro-holes 132 and 142, but as shown in FIG. 4, it is preferably filled up to the inside of the micro-holes 132 and 142.

[0049] In the present embodiment, the second ink layer 151 of the color adjustment layer 150 contains an interference pigment. The color adjustment layer 150 is formed by coating such as comma coating.

[0050] (2-1-2) Forming member layer 200 The forming member layer 200 supports the decorative sheet 100. The forming member layer 200 transmits the incident light IL2. The forming member layer 200 is laminated on the back surface 101b of the light-shielding layer 140. Although not limited, the thickness of the forming member layer 200 is selected from, for example, the range of 2 mm to 5 mm.

[0051] The material of the forming member layer 200 is, for example, glass and a light-transmissive resin. The light-transmissive resin is, for example, a light-transmissive thermoplastic resin and a light-transmissive thermosetting resin.

[0052] The molded member layer 200 is formed in the shape of the cover panel 10. In the example shown in Figures 1 and 2, the molded member layer 200 is formed in the shape of the automobile's center console 300. For example, if the cover panel 10 is plate-shaped, the molded member layer 200 will be formed in a plate shape. The molded member layer 200, which is made of resin, can be molded by methods such as injection molding, extrusion molding, blow molding, vacuum forming, pressure forming, compression molding, and machining.

[0053] (2-2) Light source 20 The light source 20 irradiates the back surface 11b of the cover panel 10 with incident light IL2. The light source 20 is positioned to face the back surface 11b of the cover panel 10 at a position corresponding to the first region Ar1.

[0054] In this embodiment, the light source 20 is composed of a plurality of LEDs or liquid crystal displays arranged in a matrix. The light source 20 is controlled by a control unit (not shown) and displays information that is perceived as a secondary object, such as the time information described above.

[0055] (3) Method for manufacturing the cover panel 10 When the molded member layer 200 is made of resin, the cover panel 10 is manufactured by simultaneously injection molding the molded member layer 200 and fixing the decorative sheet 100 to the molded member layer 200. Specifically, the method for manufacturing the cover panel 10 in which the decorative sheet 100 is fixed to the molded member layer 200 comprises the steps of setting the decorative sheet 100 in a mold and clamping the mold, and injecting molten material into the cavity of the mold to form the molded member layer 200 and bonding the decorative sheet 100 to the surface of the molded member layer 200. Alternatively, the cover panel 10 is manufactured by simultaneously injection molding the molded member layer 200 and bonding the decorative sheet 100 to the molded member layer 200.

[0056] If the molded member layer 200 is made of glass, the cover panel 10 is manufactured by bonding the decorative sheet 100 to the molded member layer 200 after the molding of the molded member layer 200.

[0057] (4) With respect to the color of reflected light RL1 and the color of reflected light RL2, the ink used in the first ink layer 131 of the design layer 130 and the ink used in the second ink layer 151 of the color matching layer 150 are selected such that the contrast between the color of the light that has passed through the base film 120 and reflected by the first ink layer 131 (i.e., reflected light RL1) and the color of the light that has been reflected by the color matching layer 150 (second ink layer 151) (i.e., reflected light RL2) is within a predetermined range. Specifically, the ink used in the first ink layer 131 and the ink used in the color matching layer 150 are selected such that the difference Δa* between the chromaticity a* of the first ink layer 131 and the chromaticity a* of the color matching layer 150 in the L*a*b* color system is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer 131 and the chromaticity b* of the color matching layer 150 is between -7 and +7.

[0058] (5) Modified Forms (5-1) Modified Form 1 The color-matching layer 150 may contain metallic pigments. The design layer 130 may also contain aluminum paste.

[0059] (5-2) Modification 2 The decorative sheet 100 may have at least one of the design layer 130, the light-shielding layer 140, and the color-matching layer 150 formed using silk screen printing. In other words, the manufacturing method of the decorative sheet 100 may include a step of forming at least one of the design layer 130, the light-shielding layer 140, and the color-matching layer 150 on the base film 120 using silk screen printing. In this case, since the micro-holes 132 and 142 are formed by silk screen printing, laser processing is not required. Figure 5 is a schematic cross-sectional view of the cover panel 10 according to Modification 2.

[0060] The color-tuning layer 150b of the cover panel 10 according to the modified example 2 may be formed between the design layer 130 and the light-shielding layer 140 to block the micro-holes 132 and 142, as shown in Figure 5, or it may be formed on the back surface 101b of the light-shielding layer 140.

[0061] (6) Features The decorative sheet 100 comprises a base film 120, a design layer 130, and a color-matching layer 150. The design layer 130 has a design (i.e., a primary object) represented by a first ink layer 131 provided on the base film 120, and a plurality of light-transmitting microholes 132 are formed in the first ink layer 131. The color-matching layer 150 has a second ink layer 151 that seals the microholes 132. In the L*a*b* color system, the difference Δa* between the chromaticity a* of the first ink layer 131 and the chromaticity a* of the color-matching layer 150 is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer 131 and the chromaticity b* of the color-matching layer 150 is between -7 and +7.

[0062] In the decorative sheet 100, the difference Δa* between the chromaticity a* of the first ink layer 131 and the chromaticity a* of the color-matching layer 150 is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer 131 and the chromaticity b* of the color-matching layer 150 is between -7 and +7. Therefore, the contrast between the color of the reflected light RL1 that passes through the base film 120 and is reflected by the first ink layer 131 and the color of the reflected light RL2 that passes through the base film 120 and is reflected by the color-matching layer 150 (second ink layer 151) is suppressed. Consequently, in the display device 1 using the decorative sheet 100, the micro-holes 132 are difficult to see when the light source 20 is not lit.

[0063] The decorative sheet 100 may have an interference pigment in the second ink layer 151 of the color-matching layer 150.

[0064] Interference pigments have the characteristic of being able to change the color of light using interference, while still allowing some light to pass through without causing a change in color. Therefore, by including interference pigment in the color-tuning layer 150, the decorative sheet 100 can suppress the change in color of transmitted light TL1 that passes through the color-tuning layer 150, while causing a desired change in color of reflected light RL2 that is reflected by the color-tuning layer 150. Thus, the decorative sheet 100 in which the color-tuning layer 150 includes interference pigment can suppress the visibility of the micro-holes 132 when the light source 20 is not lit, while also suppressing the change in color of transmitted light TL1 that passes through the color-tuning layer 150.

[0065] The decorative sheet 100 may have a second ink layer 151 of the color-matching layer 150 that contains a metallic pigment.

[0066] Metallic pigments have the characteristic of changing the color of light through reflection, while allowing some light to pass through without causing a change in color. Therefore, by including metallic pigment in the color-tuning layer 150, the decorative sheet 100 can suppress the change in color of transmitted light TL1 that passes through the color-tuning layer 150, while causing a desired change in color of reflected light RL2 that is reflected by the color-tuning layer 150. Thus, the decorative sheet 100 in which the color-tuning layer 150 includes metallic pigment can suppress the visibility of the micro-holes 132 when the light source 20 is not lit, while also suppressing the change in color of transmitted light TL1 that passes through the color-tuning layer 150.

[0067] The cover panel 10 may include a molded member layer 200 on which decorative sheets 100 are laminated.

[0068] In the display device 1 using the cover panel 10, the micro-holes 132 are difficult to see when the light source 20 is not illuminated.

[0069] The display device 1 may include a cover panel 10 and a light source 20 that irradiates the cover panel 10 with incident light IL2 from the molded member layer 200 side.

[0070] In the display device 1, the micro-holes 132 are difficult to see when the light source 20 is not illuminated.

[0071] The method for manufacturing the decorative sheet 100 may include the steps of forming a first ink layer 131 on a base film 120 and forming microholes in the first ink layer 131 by laser processing.

[0072] The manufacturing method for the decorative sheet 100 may include a step of forming a design layer 130 and a color-matching layer 150 on a base film 120 by silk screen printing.

[0073] The method for manufacturing the cover panel 10 may include the steps of setting a decorative sheet in a mold and clamping it, and injecting molten material into the cavity of the mold to form a molded member layer and bonding the decorative sheet to the surface of the molded member layer.

[0074] <Second Embodiment> (1) Overall Configuration Next, the cover panel 10a according to the second embodiment will be described. In the following, the differences between the cover panel 10 and the cover panel 10a will be described in detail, and descriptions of the same or corresponding features or well-known technologies may be omitted. Figure 6 is a schematic cross-sectional view of the cover panel 10a.

[0075] The main difference between cover panel 10 and cover panel 10a is that the color-tuning layer 150a of cover panel 10a is formed of a light-transmitting resin used for the molded member layer 200 of cover panel 10, and the molded member layer 200 is not formed. In other words, in cover panel 10a, the color-tuning layer 150a performs the functions of the color-tuning layer 150 and the molded member layer 200 of cover panel 10.

[0076] In the cover panel 10a, the ink used in the first ink layer 131 of the design layer 130 and the resin used in the color matching layer 150a are selected such that the contrast between the color of the light that passes through the base film 120 and is reflected by the first ink layer 131 of the design layer 130 (i.e., reflected light RL1) and the color of the light that is reflected by the resin of the color matching layer 150a (i.e., reflected light RL2) is within a predetermined range. Specifically, the ink used in the first ink layer 131 and the resin used in the color matching layer 150a are selected such that the difference Δa* between the chromaticity a* of the first ink layer 131 and the chromaticity a* of the color matching layer 150a in the L*a*b* color system is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer 131 and the chromaticity b* of the color matching layer 150a is between -7 and +7.

[0077] The color-matching layer 150a may also contain interference pigments or metallic pigments.

[0078] (2) Method for manufacturing the cover panel 10a The cover panel 10a is manufactured by simultaneously injection molding the color-matching layer 150a and fixing the color-matching layer 150a to a base film 120 on which the design layer 130 is formed. Specifically, the method for manufacturing the cover panel 10a includes the steps of setting the base film 120 on which the design layer 130 is formed into a mold and clamping the mold, and injecting a light-transmitting resin into the cavity of the mold to form the color-matching layer 150a and sealing the micro-holes 132 with the resin.

[0079] (3) Modified Example The decorative sheet 100 used in the cover panel 10a may also have at least one of the design layer 130 and the light-shielding layer 140 formed using silk screen printing. In other words, the manufacturing method of the decorative sheet 100 used in the cover panel 10a may include a step of forming at least one of the design layer 130 and the light-shielding layer 140 on the base film 120 by silk screen printing. Figure 7 is a schematic cross-sectional view of the cover panel 10a according to the modified example.

[0080] (4) Features The cover panel 10a comprises a base film 120, a design layer 130, and a color-tuning layer 150a. The design layer 130 has a design (i.e., a primary object) represented by a first ink layer 131 provided on the base film 120, and a plurality of light-transmitting microholes 132 are formed in the first ink layer 131. The color-tuning layer 150a seals the microholes with resin. The difference Δa* between the chromaticity a* of the first ink layer 131 and the chromaticity a* of the color-tuning layer 150a in the L*a*b* color system is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer 131 and the chromaticity b* of the color-tuning layer 150a is between -7 and +7.

[0081] In the cover panel 10a, the difference Δa* between the chromaticity a* of the first ink layer 131 and the chromaticity a* of the color-tuning layer 150a is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer 131 and the chromaticity b* of the color-tuning layer 150a is between -7 and +7. Therefore, the contrast between the color of the reflected light RL1 that passes through the base film 120 and is reflected by the first ink layer 131 and the color of the transmitted light TL1 that passes through the base film 120 and is reflected by the resin of the color-tuning layer 150a is suppressed. Consequently, in the display device 1 using the cover panel 10a, the micro-holes 132 are difficult to see when the light source 20 is not lit.

[0082] The display device 1 may include a cover panel 10a and a light source 20 that irradiates light onto the cover panel 10 from the side of the color-tuning layer 150a.

[0083] In the display device 1, the micro-holes 132 are difficult to see when the light source 20 is not illuminated.

[0084] The method for manufacturing the cover panel 10a may include the steps of forming a first ink layer 131 on a base film 120, forming microholes 132 in the first ink layer 131 by laser processing, setting the base film 120 in a mold and clamping it, and injecting resin into the cavity of the mold to form a color-matching layer 150a and sealing the microholes 132 with resin.

[0085] The method for manufacturing the cover panel 10a may include the steps of forming a design layer 130 on a base film 120 by silk printing, setting the base film 120 in a mold and clamping the mold, and injecting resin into the cavity of the mold to form a color-matching layer 150a and sealing the micro-holes 132 with resin.

[0086] <Conclusion> Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the invention. In particular, the multiple embodiments and modifications described herein can be arbitrarily combined as needed.

[0087] 1: Display device 10: Cover panel 10a: Cover panel 11a: Front surface 11b: Back surface 15: Toning layer 20: Light source 100: Decorative sheet 101a: Front surface 101b: Back surface 110: Hard coat layer 120: Base film 130: Design layer 131: First ink layer 132: Microhole 140: Light-shielding layer 142: Microhole 150: Toning layer 150a: Toning layer 151: Second ink layer 200: Molded material layer 300: Center console 310: Select lever Ar1: First area Ar2: Second area Ar3: Third area IL1: Incident light IL2: Incident light RL1: Reflected light RL2 : Reflected light TL1 : Transmitted light

Claims

1. A decorative sheet comprising: a base film; a design layer on which a design is represented by a first ink layer provided on the base film and in which a plurality of light-transmitting microholes are formed in the first ink layer; and a color-tuning layer which seals the microholes with a second ink layer, wherein the difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-tuning layer in the L*a*b* color system is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-tuning layer is between -7 and +7.

2. The decorative sheet according to claim 1, wherein the color-tuning layer contains an interference pigment.

3. The decorative sheet according to claim 1, wherein the color-matching layer contains a metallic pigment.

4. A cover panel comprising a molded member layer on which a decorative sheet according to any one of claims 1 to 3 is laminated.

5. A display device comprising a cover panel as described in claim 4, and a light source that irradiates light onto the cover panel from the molded member layer side.

6. A method for manufacturing a decorative sheet according to claim 1, comprising the steps of forming the first ink layer on the base film and forming the microholes in the first ink layer by laser processing.

7. A method for manufacturing a decorative sheet according to claim 1, comprising the step of forming a design layer on the base film by silk printing.

8. A method for manufacturing a cover panel according to claim 4, comprising the steps of: setting the decorative sheet in a mold and clamping the mold; and injecting a molten material into the cavity of the mold to form the molded member layer and adhering the decorative sheet to the surface of the molded member layer.

9. A cover panel comprising a base film, a design layer on which a design is represented by a first ink layer provided on the base film and in which a plurality of light-transmitting microholes are formed in the first ink layer, and a color-tuning layer that seals the microholes with resin, wherein the difference Δa* between the chromaticity a* of the first ink layer and the chromaticity a* of the color-tuning layer in the L*a*b* color system is between -7 and +7, and the difference Δb* between the chromaticity b* of the first ink layer and the chromaticity b* of the color-tuning layer is between -7 and +7.

10. A display device comprising a cover panel as described in claim 9, and a light source that irradiates light onto the cover panel from the color-tuning layer side.

11. A method for manufacturing a cover panel according to claim 9, comprising the steps of: forming the first ink layer on the base film; forming the microholes in the first ink layer by laser processing; setting the base film in a mold and clamping the mold; and injecting the resin into the cavity of the mold to form the color-matching layer and sealing the microholes with the resin.

12. A method for manufacturing a cover panel according to claim 9, comprising the steps of: forming a design layer on the base film by silk printing; setting the base film in a mold and clamping the mold; and injecting the resin into the cavity of the mold to form the color-matching layer and sealing the microholes with the resin.

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